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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                 2024 November 29   
      
                                     Messier 4   
                      Image Credit & Copyright: Steve Crouch   
      
      Explanation: Messier 4 can be found west of bright red-giant star   
      Antares, alpha star of the constellation Scorpius. M4 itself is only   
      just visible from dark sky locations, even though the globular cluster   
      of 100,000 stars or so is a mere 5,500 light-years away. Still, its   
      proximity to prying telescopic eyes makes it a prime target for   
      astronomical explorations. Recent studies have included Hubble   
      observations of M4's pulsating cepheid variable stars, cooling white   
      dwarf stars, and ancient, pulsar orbiting exoplanet PSR B1620-26 b.   
      This sharp image was captured with a small telescope on planet Earth.   
      At M4's estimated distance it spans about 50 light-years across the   
      core of the globular star cluster.   
      
                           Tomorrow's picture: the climb   
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